tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dd0d718152e4c65b173070d48ea9dfc06894c3e5 commit: b35b9a10362d203451d920d01ab8d6cd55cbaf2a mtd: spi-nor: Move m25p80 code in spi-nor.c date: 11 months ago config: microblaze-randconfig-r033-20200623 (attached as .config) compiler: microblaze-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout b35b9a10362d203451d920d01ab8d6cd55cbaf2a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ERROR: "min_low_pfn" [drivers/ntb/ntb_transport.ko] undefined! ERROR: "min_low_pfn" [drivers/rpmsg/virtio_rpmsg_bus.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org